Most Sydney conforming hairs have mesh on neck bone and head is empty bone without any obj.
It works best when you open hairs from library, open joint editor window and copy center setting from V4 neck and head bones to hairs bones.
Later using grouping tools "select all" hairs and create prop. Fit this prop as well as possible to Victoria head. If looks good, select hairs with fixed joints, select neck (or head if hairs are on head bone) and "replace body part with prop"